Flies are buzzing?
All of a sudden I have flies in the house. The house has been closed up for some time and the furnace has been running. We don't have the doors open for any other reason than to come in or go out. The flies just suddenly showed up, as soon as I kill one, here comes another. It's bizarre and it's driving me crazy. They are pretty slow and seem to be drawn to lights and windows. They are just your every day fly really. I'm trying to figure out where they are coming from.